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Unicellular Organisms

Unicellular Organisms. Learning Intention: Describe the general structure of unicellular organisms and the functions of cellular components and organelles. General Characteristics. 1. Eye spot- a spot that acts as a light receptor (sensor)

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Unicellular Organisms

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  1. Unicellular Organisms Learning Intention: Describe the general structure of unicellular organisms and the functions of cellular components and organelles.

  2. General Characteristics 1. Eye spot- a spot that acts as a light receptor (sensor) 2. Contractile Vacuole- organelle that holds excess fluids. It periodically empties this into the cytoplasm. This forces water out of the cell

  3. General Characteristics 3. Cilia – small hair like projections. Many extend from a cell. Single celled organisms use them for movement. They beat in one direction 4. Flagellum – very much like cilia, but are long and there are only a few per cell. Also used for movement http://www.youtube.com/watch?v=BbI47l2nbDQ http://www.youtube.com/watch?v=Ey7Emmddf7Y

  4. General Characteristics 5. Oral groove- Used to take up food. Cilia beat food particles toward oral groove

  5. Amoeba • Food vacuole • Contractile vacuole • Nucleus http://www.youtube.com/watch?v=7pR7TNzJ_pA

  6. Euglena • Contractile vacuole • Chloroplast • Nucleus • Flagellum • Whip like structure used for propulsion • Eyespot • Light sensitive pigment shield. Allows organism to respond to light. http://www.youtube.com/watch?v=J3sgoy22Ij4

  7. Paramecium • Food vacuole • Nucleus • Oral groove • Funnel shaped groove food passes along to reach cell mouth • Anal pore • Specialised region of plasma membrane where undigested contents of food vacuoles is released

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